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  1. By: Howard, Richard A. (Richard Alden), - Garay, Leslie A. - Sweet, Herman R - Proctor, George Richardson,
    Publication info: Jamaica Plain, Mass Arnold Arboretum, Harvard University 1974-1989
    Holding Institution: Harvard University Botany Libraries
  1. By: Gillis, William Thomas, - Proctor, George Richardson,
    Type: Article
    In: SIDA, contributions to botany
    Volume: 6
    Date: 1975
    Page Range: 52--62
    Publication Info: [Dallas W. F. Mahler, etc.] 1962-
  2. By: Mckenzie, Paul M - Noble, Robert E - Urbatsch, Lowell - Proctor, George Richardson,
    Type: Article
    In: SIDA, contributions to botany
    Volume: 13
    Date: 1989
    Page Range: 293--301
    Publication Info: [Dallas W. F. Mahler, etc.] 1962-
  3. By: Gillis, William Thomas, - Howard, Richard A. (Richard Alden), - Proctor, George Richardson,
    Type: Article
    In: Rhodora
    Volume: 75
    Date: 1973
    Page Range: 411--425
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  4. By: Gillis, William Thomas, - Proctor, George Richardson,
    Type: Article
    In: Phytologia
    Volume: 32
    Date: 1975
    Page Range: 201--213
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke
  5. By: Gillis, William Thomas, - Proctor, George Richardson,
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 55
    Issue: 3
    Date: 1974
    Page Range: 425--430
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  6. By: Barkley, Fred A. (Fred Alexander), - Proctor, George Richardson,
    Type: List
    In: Plant lists and correspondence
    Date: 1949-1971
  7. By: Proctor, George Richardson,
    Type: Article
    In: American fern journal
    Volume: 40
    Issue: 3
    Date: 1950
    Page Range: 226--226
    Publication Info: [Washington, etc.] American Fern Society
  8. By: Mckenzie, Paul M - Michael, Peter W - Urbatsch, Lowell - Noble, Robert E - Proctor, George Richardson,
    Type: Article
    In: SIDA, contributions to botany
    Volume: 15
    Date: 1993
    Page Range: 527--532
    Publication Info: [Dallas W. F. Mahler, etc.] 1962-
  9. By: Proctor, George Richardson,
    Type: Article
    In: Rhodora
    Volume: 60
    Date: 1958
    Page Range: 323--326
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  10. By: Keron C. St. E. Campbell - Judeen Meikle - Tracy Commock - Lori-Ann Harris - Proctor, George Richardson,
    Type: Article
    In: Moscosoa : contribuciones científicas del Jardín Botánico Nacional "Dr. Rafael M. Moscoso"
    Volume: 20
    Date: 2022
    Page Range: 13--39
    Publication Info: Santo Domingo, El Jardín, 1976-
  11. By: Proctor, George Richardson,
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 63
    Issue: 3
    Date: 1982
    Page Range: 199--315
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  12. By: Proctor, George Richardson,
    Type: Article
    In: Rhodora
    Volume: 61
    Date: 1959
    Page Range: 305--306
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  13. By: Proctor, George Richardson,
    Type: Article
    In: American fern journal
    Volume: 48
    Issue: 3
    Date: 1958
    Page Range: 108--108
    Publication Info: [Washington, etc.] American Fern Society
  14. By: Proctor, George Richardson,
    Type: Article
    In: Phytologia
    Volume: 35
    Date: 1977
    Page Range: 403--403
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke
  15. By: Proctor, George Richardson,
    Type: Article
    In: Rhodora
    Volume: 61
    Date: 1959
    Page Range: 218--219
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  16. By: Howard, Richard A. (Richard Alden), - Proctor, George Richardson,
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 39
    Issue: 2
    Date: 1958
    Page Range: 101--106
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  17. By: Webster, Grady L. (Grady Linder),‏ ‎ - Proctor, George Richardson,
    Type: Article
    In: Rhodora
    Volume: 86
    Date: 1984
    Page Range: 121--125
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  18. By: Proctor, George Richardson,
    Type: Article
    In: American fern journal
    Volume: 75
    Date: 1985
    Page Range: 56--70
    Publication Info: [Washington, etc.] American Fern Society
  19. By: Proctor, George Richardson,
    Type: Article
    In: Rhodora
    Volume: 63
    Date: 1961
    Page Range: 31--35
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  20. By: Proctor, George Richardson,
    Type: Article
    In: Rhodora
    Volume: 68
    Date: 1966
    Page Range: 464--469
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  21. By: Proctor, George Richardson,
    Type: Article
    In: Rhodora
    Volume: 59
    Date: 1957
    Page Range: 303--306
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  22. By: Proctor, George Richardson,
    Type: Article
    In: Rhodora
    Volume: 49
    Date: 1947
    Page Range: 53--54
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  23. By: Mckenzie, Paul M - Noble, Robert E - Urbatsch, Lowell - Proctor, George Richardson,
    Type: Article
    In: SIDA, contributions to botany
    Volume: 13
    Date: 1989
    Page Range: 423--447
    Publication Info: [Dallas W. F. Mahler, etc.] 1962-
  24. By: Proctor, George Richardson,
    Type: Article
    In: American fern journal
    Volume: 72
    Date: 1982
    Page Range: 107--114
    Publication Info: [Washington, etc.] American Fern Society
  25. By: Howard, Richard A. (Richard Alden), - Proctor, George Richardson,
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 38
    Issue: 1
    Date: 1957
    Page Range: 1--50
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  26. By: Howard, Richard A. (Richard Alden), - Proctor, George Richardson,
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 38
    Issue: 2
    Date: 1957
    Page Range: 151--169
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-